You cant avoid injuries,but in hight lvl they are not so long like in 1-st (mean i dont have broken playes for more than 4 days long time ago) and is easy to keep top players on the feeld.Mb 1 of the ways is to give rest to players when you have easy future win or sub top players when you make big result.Other way is -->spend money,buy tokens,buy a lot of red packs